#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# @Time    : 2019/4/29 14:52
# @Author  : 何胜金-heshengjin
# @Site    : 
# @File    : magic_method.py
# @Software: PyCharm
"""
魔术方法
__getattribute__ 总是被调用
__getattr__ 不存在才被调用
"""


class MagicMethod(object):
    def __new__(cls, *args, **kwargs):
        return super(MagicMethod, cls).__new__(cls)

    def __init__(self, name, author):
        super(MagicMethod, self).__init__()
        self._name = name
        self._author = author

    def __getattr__(self, item):
        print("__getattr__,属性【不存在时候】调用该方法")
        return super(MagicMethod, self).__getattr__(item)

    def __getattribute__(self, item):
        print("__getattribute__,属性【存不存在都会】被调用")
        return super(MagicMethod, self).__getattribute__(item)

    def __setattr__(self, key, value):
        print("设置属性时候调用")
        return super(MagicMethod, self).__setattr__(key, value)

    def __delattr__(self, item):
        print("删除属性调用")
        return super(MagicMethod, self).__delattr__(item)


if __name__ == '__main__':
    # 属性：_name/_author存在
    # 属性：_hsj不存在
    m = MagicMethod("MagicMethod", "何胜金")
    print(m._author)
    try:
        print(m._hsj)
    except Exception as e:
        print("发生异常，属性不存在，原因：{}", e)
